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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60db1a976db1ca705d1834e939db9243f3e624976809f47cd6f4f41e6e05256e' 
  AND token = 'C9nnnx7TPQpxYUKdNYUCPJDUCaEl7gz9Yd94SR6neQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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