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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98392eff8901fe0b1456adbc4ad6460a48765502fdf1efce9d1c245bda502ead' 
  AND token = 'HKtHV6sRgWPtYdjtW13msJn+0vTjylaWzTmHYMuV+BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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