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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7145bf597d7f3e7b42a1458dc13737e89c8680f8b3ef907377384e2952d09e' 
  AND token = 'OSusCSBqRsOZ50deVuRRgjwXZDfEL08O6qyH/PB4JR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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