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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d7c8c1d5bef4fa97e64469bf098a906f6b5ae1e88ee8b7f7985839f3ec4edf' 
  AND token = 'yV0NvHxgleUwn5tSU3GpgdGCbrpF88LEl3Eqj19VdR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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