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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1af982df6d2924862bc5c7978403ae860d6166ca396c3e6563bd2398d7ba130' 
  AND token = 'BylAIfyJtr2Iu8v8h6fEJTk2JEmCaC5KFvYgKZGYlms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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