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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976f7edc7311a1b0ed968b54f929860155f8736a538eb4b044c70de7d4e7faaf' 
  AND token = 'Q9rVlyjyHTtc6AJR3a3WT2WfW6kC1TzkEURMeAAYKdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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