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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20626b51c6e8caced88157b49f9ec1ba3e521e86c9e01c2dde96055b5fea20c5' 
  AND token = 'vJ8EgZPEX+s8/UbP4XTYHL0DKd12xkEw1repddaS8GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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