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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9051d685672c0f5ca05c693f3a4d2d3940fb1b6007ba0d5b98eccd1a9f5f529' 
  AND token = 'xFYxEQ/ifKK1VWjEhsKsl+KLHLktINE4MpTvDclWAxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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