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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '306bd2bb011cbd00edd00265c3f46c992d5c609d98907bcd7353f72ff025f4a1' 
  AND token = 'wwaRc4XJS1VtcaOwXeYfW5VrIawWbtNd6nr7lK4K7S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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