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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a7da81bc239dde859b5a223cfa941f2bc9b716c47131e95983b6e3cd85cf9b' 
  AND token = 'AIG4t4ktb2WglOjhLVMMgFw1R05fCSn/U/PL9XjotLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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