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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ebf4cd7165fdffc8a4c085b30939d82c26b558cfc2e3bae21ae1a3240274122' 
  AND token = '8QSfR+6pfFzWq2b03HxD9vqRKqpf2cX2/sgSAQBpkZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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