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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13cf379b39e31db25fa054e83e8d083c01e25e72f8f08c8c6a2d7f420eadfb2d' 
  AND token = 'EApyUJ8cqIud/inWKc2F3P7uKosJqGZpdKevDt6kXcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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