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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5428fdb63a3d68f19a898a80b9ce1817fd7b0ebd77de1b003c9c89ab3802a71b' 
  AND token = 's93YI7vxD4Y0kq3boTSy2LECmilmFHMxPxJTJgaA/cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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