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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f318d7f677bc63806150b1512a11f3b1b474736ab41cf7ea80ac5ec5ffe58be' 
  AND token = 'WLEV6GdCWTB0/ux+68jlK7bUh8eVCRTrWPfus4LZz6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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