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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f58c91864b14b05e7f6fbc3569a0b434ed36945f59cf655d3e737a40c6a4e42' 
  AND token = 'hYxEPoVKqWqoGmxePoDMsA+M+tcu8UwCN9in5LWTZ7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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