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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6644aee5630ff6c93498430b4f2b531cd806e4e8c1249414d2d82f64721ca2b' 
  AND token = 'WrOmy2vNqREIql6BwD8dWl3gAOPUw/5sGd37RA9I/+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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