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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e917aa3118ca01ab1c68bd2f07cf92a35ab8cff42b526a36d826e3182d73cbd2' 
  AND token = 'DmoU85IbbEXc3aElx31o6fjbQIL7uwdFoTJnyVtFbhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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