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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e024faa9fa296ea8815e941908c5ef2b34216df8eb9ad4645e998171319a9ff4' 
  AND token = 'akaqDRXJlIHMRVYElX+BRhCqmCquIzI5QXZ3sn0fd3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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