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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c894d80facebec4462528ea16bd968f1461e59e60653d29f606ab27b7f35abd4' 
  AND token = 'bEENvnoHO9MV/d2jn3KmmbwvW1qUg4uyRDOlM/Zb1jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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