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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68fddbce23e451d06d240cb3c435d33b83e83f9b34f738b1f7b715c5f955a9e' 
  AND token = 'K09D/c3gKNt0EzkPvASU9GUmAl1b4qMp5yFsqbZ/wJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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