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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1178cc3769e6e5dc02d0f88bb6e3e4c37908bea1f664288859f3cae41d002614' 
  AND token = 'h1j1tS02jXjzjg0eCy8Is3FeIY0hW5Lwja+3+vmECXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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