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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e62b0d5e2872f4a97502288add303697eb52042fc5d14570bcd8b3db249494' 
  AND token = 'QR8Zn6kaGauTbJxnj1sg/VUCGrxXvDsOATHw/eb/EtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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