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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8fa21343d792f1841a0e171930cf35c95037cfbd4b42460ec2d78c7ac58128c' 
  AND token = 'baaX/7BFBemU+yV9ju6tIT5rgHCsf7t2ZkOQX3u6M+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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