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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc50ca83725c70c2994079c5ffb4cadfd737f018789a9323d7e76f798edff71' 
  AND token = 'oV/ENZIbmshb+e/TNfcpXu5rz0PJG6CtJtMnJ2weFUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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