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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df80cec89277d9ab97ed61e0625eb275f4a802402d01a214be8d6ee3ef6d9b84' 
  AND token = '3bEhgMUSVnXOscFFVA8Q+bRDjadoDS3rIP71sYabPwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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