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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0afd0f8e65036b8329d0ea0b0b0d7154d56e19fd1f2f97a1ef46bbef56567b04' 
  AND token = 'wIPM0TvQYz9Qt69TTA8x/zCftIUcC4jYZRFPwCzGCaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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