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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '708c7370745042ac70952aa6f75c39ed85eb9c22db9789e65a045c33029f730b' 
  AND token = 'dsGI+9Sh3pUxIB4hB9jxaUl/+9r3GjNzzCiAl16qD18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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