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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daca780b14f4b76a22195f08ef33da1b06b4821cab78096a7a634244124eca2a' 
  AND token = 'M/iDWinrk2mf4GNar1IKoiHxFqD18a6KM7Zuvhjf6kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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