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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '124ab1097ab4d97b9d537be5f8404b9e72709a359b1fc2c3d9058ceb250d2707' 
  AND token = 'REWtPAz03cERBp6qqxgTvKr3WHD531K2Dv6dFo+gKfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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