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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ef29c217b4aaecef78ee9a0c8a8f25616da3d8cf386225d94ce9db68fe2621' 
  AND token = 'ThgCwM7bdnEFgzN9wqULEm9+Kr5I71BZS/+3pOTnuMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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