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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '915b6f011c5fd3f125c76826a3169e81c8132e45744aa7cdb371c60ef054cce6' 
  AND token = 'GnPH1diUCh6fzfhG2gdCDRReRDm7X1n8U9EmzIF72pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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