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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b47870f1acec1d0516581f4185abe4e7ebb2f4428e6123182a2d32fea61666f' 
  AND token = 'gHoFeeiLkvgk562vKA6P70fveBRBW1xJ6THlvB7dkNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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