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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80b457ba4b9f0ea08945a78ff58aa1ca0c91698dd7e723583e3475afd8ca1c80' 
  AND token = '8AX90gh6jKq2gSwaGn98/MssT1q+Nqqi7BT2JHuuzqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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