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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '123a1f4e76c597517949adb9aa2c191bcce21a2105bfc4eb051bce28d1cc8ef4' 
  AND token = 'hWCx2/VfTLuXv2vmwnz65fLKjNpq7eICnGNSCZjfwIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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