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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a4eabc383d58f6d8d99e3e439e3479b9299e88a9e370d8760e366cf4cf3152' 
  AND token = 'WOqIBlhM273y0JnTlvv15fwcNVl1t7sozp1VYy+cepo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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