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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28cfbadb993e031c3d6e930fd63b9b1111fc47377c3a18d5a1697f6fd16dca3' 
  AND token = '7aiQqSI9XrPxXxT5FiMq7Hf5+QdgyfFH86Scb3S/4yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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