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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f9d6f463a7b62b97677fc04c06676bae3a88399da5c088de25c4df8a1c2550' 
  AND token = 'WGOQ0YmPF59YZ1Dv1qXpULYf0XFCuNSjKok6ip488Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}