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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95dbb02107ed6b0c456bd16e454c575f32b1af192b1d8dd19633edd991b5e88c' 
  AND token = 'N7lFNodh0lH9oUcc/n47nWadZPDcDRne+q2MpkLVBcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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