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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0236cd025b1b1e95093771599862b1c8517782fc2842861945d38902bc3e517e' 
  AND token = '7IVFfn1Nwck0AyKaPtOx3mSiEzsdHOaI3C7s7LeMznk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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