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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb2d54f758a89887581c122d6606b5ef796fa30f4cd85d329b963c4c9cfa5ba' 
  AND token = 'pnNpsw3ESysg81SPkpC185hYgnqZ0qQ2qj5B3mdEVaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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