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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db38f9ef63765817010677d203e6e31da1c0479a9977d711cc3501c99be481c5' 
  AND token = 'tM1yjoKywUNATJThIWEJze+H1z4ORtE79OTJSrx0r5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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