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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de5623edbfd1c85a1bed5dbb934ec4360e9c4aace1fac5108d239f8a40b1b70' 
  AND token = 'd16ObsQuMzhejU0IMMs+WpRFdePqr3oU676POIlMjB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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