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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90860bf08368a95792a6b1930cf2b3cbe90ef6c774dd92f5ba2a074a2d54a4c2' 
  AND token = 'gMCfziyq60voPFbc0kdaxEKZ4UIcoL+NzB3WcLYVvLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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