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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '133631c189864271312ac3ec09b0fcbe6ac1e473005556583bcd977e38cdfc39' 
  AND token = 'ZOde6QuUd7RV4rsg5CoSFWg8s9SUrz9S9gWLL9ljUbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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