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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdb112e5b8758d8229dcda8d8a1dc042829f481cb330bc5274b5d1a7f4cd5e3' 
  AND token = '1m7udCHD1w1OjDEBax3BORRRGCwTeg7xjdp+atiai5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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