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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7522a3d724315a87b620e0ba22d552011b5b35d7ff860496bbe63ad4b2b0300d' 
  AND token = 'vgi/97MLqgCjaCoua+ynPcpDw1N9zppo7n2B18vQICQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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