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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80af0aeef00d55ebf1a4cfe713876b07f5420527412bbadcb3d9517796d7e431' 
  AND token = 'q0miHJrx7/BLNF2L2m92tjSAP8gEG8a/+MnQ/FRl398=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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