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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2549a0fa2ff267442aabfdad987afd9345d1f8f6850e08c657e330590c1b0e86' 
  AND token = 'oYxzb1g4rx5YA1Z9JgDQ8dpclUxGbJNvEpDLEyZ8ITU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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