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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b914cf669a1f406d38f09240ae05e3fbb221cc4f56dfbdf4648a5cfcfb2933' 
  AND token = 'EwGAWKNP5e8vA8cyHQ/Je4cbGDAF+8k6d3dX8MGgrnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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