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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20035f9fb1591dde55f7edf2236cde96415ae74c9088819f49ad77faf15054a5' 
  AND token = '3K11U6X6v8vyG/m6yeWarUK3NR3PtJLKuIeU7rB0X5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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