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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9be5abdbb2ba3e44b55cad0e3ca2ba80b012d2830c2f306e1f42a85c49eff7b' 
  AND token = 'JYvxSUPZ9bA3a2cQQPNkq7DHjSqA9xK41bBFCtnm+Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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