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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ca66fb20e6b9fba014b98c7616c93f69767971785d332b8455b4986e3727db' 
  AND token = 'vo3CIaZvdTZcEG3eGwcLXGNGyY2pDwgH0kcibAKr3/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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