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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3420393ada93b725ad58a8aebed0d661c183b0380c9b3d20761251f2c5b96867' 
  AND token = 'JZ8aYgJpvbOpBHzS1Hc6LAWr8IJYg42zosruJyk+LuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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