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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd79aaa1b2f8cb46be70cecc8d4c8e20a6db32a0c43aab10984f50f708a203f' 
  AND token = 'FHnxAfUgqFSnlECX88htWFzlUrOAOG9fuCJqJpJS1l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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