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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a1895b45e2c871a87dd1cd5af7de53569851ba5956a3bbda3bf4e23b779828' 
  AND token = 'h8tcJ6cNUIjy6BDs3dJ4Qaw8i/46bixUQRa9Naa4DBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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