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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1545e052d79c1ad21f207e882543c96dd2034603827d841d5609817a7c898388' 
  AND token = 'Zj6x/fqe8V1nSpvn11pEUfMpye/Kv5RK0wzhUims0m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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