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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd79ad25d56513127680bf5c478d75637fc547b2f8e025f7253058a26f5cc09' 
  AND token = 'c/qRnRVHNQsRpGD4F63y2lab+e/Wa76B0U5NbczKMqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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