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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093b9a29cbd4e2235e3ebc323e3604a94c67b99e602029db892d8f7b7180d58e' 
  AND token = '3jmJV4mRJCsj0HLE1varz3E/TmcdYgK8oXa5tTZiO4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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