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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e9ff4a6603564b484d665c23b5220c3a849a4bae82e6582af3de11f530db1ea' 
  AND token = 'Ylgei6FsevJh1Ly9vcHbjXwe8MMUL2zsgEPXgd3EEVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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