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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b02b860393d17de7625e24163b3e5174e2268cd4a6aacd12ba0fe350f8b081' 
  AND token = 'LeiAft+AlwFp919aBoTnUnPyR/yr+gB8ZwJQDU1zE7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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