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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ecaee0636bb861093b470cd9503f32792dff691fe07d1e0a4a5e6a97cc3d8d4' 
  AND token = 'aXXvrsXMrDXclf4aSp+9qGwf9GzphR+YgAXmjTIuO2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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