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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e7e3db8687881ac1bd5c2368366fbf6c47722192e6044d377a083574120e8e' 
  AND token = 'j6haJwaie1HTBwu9XX7ua7tHQFKlw7u76NJainuspqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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